[dovecot/core] 592289: configure: Switched version number to 2.3.devel

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 592289f4d16f2f18e9975861390a0a04c7c7d7b9
      https://github.com/dovecot/core/commit/592289f4d16f2f18e9975861390a0a04c7c7d7b9
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2016-04-13 (Wed, 13 Apr 2016)

  Changed paths:
    M configure.ac

  Log Message:
  -----------
  configure: Switched version number to 2.3.devel